2-(2, 6-dimethoxybenzoylthio) acetic acid



United States Patent F 3,17 8,466 2-(2,6-DIMETHOXYBENZOYLTHIO)ACETIC ACID Wilbur Benedict McDowell, East Brunswick, andWilhert Schmidt, Spotswood, N.J., assignors to 01in Mathieson Chemical Corporation, New York, N.Y., a corporation of Virginia N0 Drawing. Filed July 17,. 1962, Ser. No. 210,552 1 Claim. (Cl. 260-455) I The following example is illustrative of the invention.

EXAMPLE Preparation of 2-(2,6-dimeth0xybenzoylthio)acetic acid 15 ml. (0.21 m) of thioglycollic acid in 25 ml. of diglyme (diethyleneglycol dimethyl ether) are added over a period of min. to 42 g. (0.21 m) of 2,6-dimethoxybenzoyl chloride in 50 ml. of diglyme with stirring. The temperature rises to 44 C. and HCl is evolved. The mixture is stirred for 1 hr. and the temperature drops to room temperature. It is then heated with stirring for 3,173,466 Patented Apr. 13 1965 ice about 1 hr. on the steam bath, cooled to room temperature and pouredinto 200 ml. of water. The oil which forms is separated from the aqueous layer. An additional 200 ml. of Water are added to the aqueous layer and more oil is separated. The combined oil layers are Washed with 200 ml. of Water and the oil separated. The oil is taken up in ether (ca. 500 ml.) and dried over MgSO filtered and evaporated to dryness on a flask evaporator to yield a residue of 44.3 grams. The residue is dissolved in ml. of toluene with heating on the steam bath. The product crystallizes on storing at 5 C. This crude product melts at 103-115 C. On recrystallization from toluene the 2-(2,6-dimethoxybenzoylthio)acetic acid melts at 127.5-130.5 C.

What is claimed is:

2-(2,6-dirnethoxybenzoylthio)acetic acid.

References Cited by the Examiner UNITED STATES PATENTS OTHER REFERENCES Chem. & Eng. News, Sept. 12, 1960, page 49.

CHARLES E. PARKER, Primary Examiner.

D. D. HORWITZ, Examiner. 

